A particular chemical reaction occurs at room temperature (293 K) at half the rate that it does at 300 K. What is the activation energy for this reaction?
a. 
b. 
c. 
d. 
a.
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A spinning neutron star has been observed at the center of a
A) supernova remnant. B) planetary nebula. C) red supergiant. D) protostar.
The axial tilts of Uranus and Neptune are the same
Answer the following statement(s) true (T) or false (F)
The sun's energy output is a maximum in the visible region of the spectrum. One biological reason we might expect or predict this fact is that
A) it would be impossible for biological photosynthesis to occur if any other region dominated the solar spectrum, and thus plant life could not exist on Earth. B) the visible region comes right in the middle of the overall electromagnetic spectrum. C) visible radiation is the only type of solar radiation with enough energy to actually burn our skin. D) the human eye would be expected to evolve in such a way as to make use of the sun's main energy output. E) the visible region has the highest frequency.
A figure skater on ice with arms extended, spins at a rate of 3.5 rev/s. After he draws his arms in, he spins at 6.0 rev/s. By what factor does the skater's kinetic energy change when he draws his arms in?
a. 2.4 b. 1.7 c. 0.58 d. 0.12